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If the ring was made of normal material surely the excess electrons that make up the negative charge would be tied to atoms and rotate with the ring, would the rotation of the ring not be equivalent to a current flow that would generate a magnetic field
I have a feeling that the field would be different if the ring were made of an insulator of a conductor. In the case of a charged insulator, the 'current' would be just due to the net effect of movement of all the captive charges on the surface. With a spinning metal ring the effect of an induced emf (Lenz's law?) might well cause the charges to stay still whilst the material of the ring revolved. Can anyone get their head round that and help me?
I was assuming that the charge remains stationary relative to the rotation of the ring. Also my question was pretty ambiguous, I know there would be magnetism relative to a stationary object outside of the rotating ring, but my question was more along the lines of how would part of the ring view the magnetic effect of other parts of the ring.
Im not sure, how you how you would classify relative motion in a rotating ring. For example, for simplicity consider a gravitron Instead of thinking of a ring, a gravitron is a ride that spins around very fast, so that everyone inside sticks to the walls. Inside the gravitron, you would consider everyone at rest, you could make perfect eye contact with anyone in the ride, so you may say there is no relative motion. However, if you think about it the person opposite from you in the gravitron is always traveling in the opposite direction from you at twice your angular velocity. So the question is which frame of reference rains supreme?
I believe it was Mach who said that we must consider rotation to be relative to the remote stars, but I do not know whether this is the modern view or if we should consider it to be relative to the whole universe or our local galaxy
okay, if you were on one side of a rotating ring, and you were viewing an object on the opposite side of the rotating ring, would you consider the other object at rest relative to you, or would you consider it as always traveling in the opposite direction relative to you?